Hahaha! 😂 I love this exchange of thoughts. Well, that's what we were told. I think it's an ancient folklore that old folks use to scare kids. Hahaha! 😂
But I have looked into it, and this is what I've read:
"No, moth dust can't cause blindness, if you got the 'dust' from their wings into your eyes, it would hurt you. The'dust'is just their wing scales flaking off. It's suggested that moth scales can be a potential allergen and eye irritant - though the scales are not toxic in themselves."
Source